Reducing Circling Currents in a VHF Class Φ 2 Inverter Based on a Fully Analytical Loss Model

Desheng Zhang, Run Min, Zhigang Liu, Qiaoling Tong, Qiao Zhang (), Ting Wu, Ming Zhang and Aosong Zhou
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Desheng Zhang: School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China
Run Min: School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China
Zhigang Liu: Beijing Institute of Spacecraft System Engineering, Beijing 100094, China
Qiaoling Tong: School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China
Qiao Zhang: School of Automation, Wuhan University of Technology, Wuhan 430070, China
Ting Wu: Beijing Institute of Spacecraft System Engineering, Beijing 100094, China
Ming Zhang: Beijing Institute of Spacecraft System Engineering, Beijing 100094, China
Aosong Zhou: Beijing Institute of Spacecraft System Engineering, Beijing 100094, China

Energies, 2022, vol. 15, issue 22, 1-17

Abstract: This paper proposes a fully analytical loss model to reduce circling currents and improve the power efficiency of a class Φ 2 inverter. Firstly, analytical expression of the switching node voltage is derived by analyzing its harmonic components. Based on the result, the power switch is modeled as a voltage source, where the circuit is simplified to a linear network and analytical expressions of branch currents are solved. Secondly, root mean square (RMS) values of branch currents and component losses are calculated to form the analytical loss model for a Φ 2 inverter. The influence of circuit parameters on the circling current and power efficiency are thoroughly analyzed, which derives optimal design constraints to reduce circling currents of a class Φ 2 inverter. Furthermore, detailed design guidance and equations are provided to calculate circuit parameters of a class Φ 2 inverter, which reduces its circling currents and improves overall power efficiency. Finally, a class Φ 2 inverter prototype is built, and experimental results demonstrate a 7% efficiency improvement compared to conventional empirical design methods.

Keywords: very high frequency (VHF); class ? 2 inverter; circling current; design method; efficiency (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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